韩国各种来源的废物处理残渣中汞的浸出特性。
Mercury leaching characteristics of waste treatment residues generated from various sources in Korea.
机构信息
Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, Republic of Korea.
出版信息
Waste Manag. 2013 Jul;33(7):1675-81. doi: 10.1016/j.wasman.2013.04.004. Epub 2013 May 13.
In this study, mercury (Hg) leaching characteristics of the waste treatment residues (fly ash, bottom ash, sludge, and phosphor powder) generated from various sources (municipal, industrial, medical waste incinerators, sewage sludge incinerator, oil refinery, coal-fired power plant, steel manufacturing plant, fluorescent lamp recycler, and cement kiln) in Korea were investigated. First, both Hg content analysis and toxicity characteristic leaching procedure (TCLP) testing was conducted for 31 collected residue samples. The Hg content analysis showed that fly ash from waste incinerators contained more Hg than the other residue samples. However, the TCLP values of fly ash samples with similar Hg content varied widely based on the residue type. Fly ash samples with low and high Hg leaching ratios (RL) were further analyzed to identify the major factors that influence the Hg leaching potential. Buffering capacity of the low-RL fly ash was higher than that of the high-RL fly ash. The Hg speciation results suggest that the low-RL fly ashes consisted primarily of low-solubility Hg compounds (Hg2Cl2, Hg(0) or HgS), whereas the high-RL fly ashes contain more than 20% high-solubility Hg compounds (HgCl2 or HgSO4).
本研究调查了来自韩国不同来源（城市、工业、医疗废物焚烧炉、污水污泥焚烧炉、炼油厂、燃煤电厂、钢铁制造厂、荧光灯回收商和水泥厂）的废物处理残渣（飞灰、底灰、污泥和磷矿粉）中的汞（Hg）浸出特性。首先，对 31 个收集的残渣样品进行了 Hg 含量分析和毒性特征浸出程序（TCLP）测试。Hg 含量分析表明，废物焚烧炉产生的飞灰中含有比其他残渣样品更多的 Hg。然而，具有相似 Hg 含量的飞灰样品的 TCLP 值因残渣类型而异。进一步分析具有低和高 Hg 浸出比（RL）的飞灰样品，以确定影响 Hg 浸出潜力的主要因素。低 RL 飞灰的缓冲能力高于高 RL 飞灰。Hg 形态结果表明，低 RL 飞灰主要由低溶解度的 Hg 化合物（Hg2Cl2、Hg(0)或 HgS）组成，而高 RL 飞灰则含有超过 20%的高溶解度 Hg 化合物（HgCl2 或 HgSO4）。
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